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The voltage for the old light is 240 I believe, but there is 3 phase in this building so would that change it to 277?
So I can hook up the new fixture which is a florescent mutli volt ballast which has a black,white, and green, to the existing 2 black wires that was coming out of the conduit that went to the existing 400w HPS light?
Would you know why there is not a neutral that would run with both of the black wires?